因式分解:(1)(a+b)x2-(a+b);(2)9(a+b)2-4(a-b)2;(3)6xy2-9x2y-y3;(4)
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因式分解:
(1)(a+b)x2-(a+b);
(2)9(a+b)2-4(a-b)2;
(3)6xy2-9x2y-y3;
(4)4+12(x-y)+9(x-y)2.
(1)(a+b)x2-(a+b);
(2)9(a+b)2-4(a-b)2;
(3)6xy2-9x2y-y3;
(4)4+12(x-y)+9(x-y)2.
![因式分解:(1)(a+b)x2-(a+b);(2)9(a+b)2-4(a-b)2;(3)6xy2-9x2y-y3;(4)](/uploads/image/z/7779529-1-9.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%88a%2Bb%EF%BC%89x2-%EF%BC%88a%2Bb%EF%BC%89%EF%BC%9B%EF%BC%882%EF%BC%899%EF%BC%88a%2Bb%EF%BC%892-4%EF%BC%88a-b%EF%BC%892%EF%BC%9B%EF%BC%883%EF%BC%896xy2-9x2y-y3%EF%BC%9B%EF%BC%884%EF%BC%89)
(1)(a+b)x2-(a+b)
=(a+b)(x2-1)
=(a+b)(x+1)(x-1);
(2)9(a+b)2-4(a-b)2
=[3(a+b)+2(a-b)][3(a+b)-2(a-b)]
=(3a+3b+2a-2b)(3a+3b-2a+2b)
=(5a+b)(a+5b);
(3)6xy2-9x2y-y3
=-y(y2-6xy+9x2)
=-y(3x-y)2;
(4)4+12(x-y)+9(x-y)2
=[3(x-y)+2]2
=(3x-3y+2)2.
=(a+b)(x2-1)
=(a+b)(x+1)(x-1);
(2)9(a+b)2-4(a-b)2
=[3(a+b)+2(a-b)][3(a+b)-2(a-b)]
=(3a+3b+2a-2b)(3a+3b-2a+2b)
=(5a+b)(a+5b);
(3)6xy2-9x2y-y3
=-y(y2-6xy+9x2)
=-y(3x-y)2;
(4)4+12(x-y)+9(x-y)2
=[3(x-y)+2]2
=(3x-3y+2)2.
因式分解:(1)(a+b)x2-(a+b);(2)9(a+b)2-4(a-b)2;(3)6xy2-9x2y-y3;(4)
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